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n in (-oo:+oo)
2.5 = n/5 // - n/5
2.5-(n/5) = 0
2.5-1/5*n = 0 // - 2.5
-1/5*n = -2.5 // : -1/5
n = -2.5/(-1/5)
n = 12.5
n = 12.5
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